[rrd-users] 5 second resolution definition.
linux at thehobsons.co.uk
Fri Sep 19 15:28:21 CEST 2008
<Gerhardus.Geldenhuis at gta-travel.com> wrote:
>I am trying to define an RRA for my graph but I do not understand how to
>define the "part" section of the RRA definition
"part" section ?
>5 minutes = 0.5
>1 minute = 0.25
>However I dont understand how this value is determined. I do not
>understand how 5 minutes can be 0.5 and 1 minute be 0.25. I can't see
>any relation so I dont know how to deduce anything further from it.
>Googling has only turned up 5 and 1 minute examples so far.
I think you are getting confused.
step sizes are defined in seconds - so "5" for 5 seconds in the rrd definition.
Then you need to define one or more DSs, and here you need to define
"heartbeat" - how long you can go between samples before the data is
deemed to be invalid. Again, this is defined in seconds.
And lastly, define one or more consolidation functions (CF). I thik
this is where you are getting confused, as "0.5" and "0.25" sound
like xff values : "xff The xfiles factor defines what part of a
consolidation interval may be made up from *UNKNOWN* data while the
consolidated value is still regarded as known." A value of 0.5 means
that HALF of the values in the consolidation interval may be unknown
before the whole interval is considered unknown.
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